@article{IM2_1995_59_5_a6,
     author = {A. A. Karatsuba},
     title = {Analogues of {Kloosterman} sums},
     journal = {Izvestiya. Mathematics },
     pages = {971--981},
     publisher = {mathdoc},
     volume = {59},
     number = {5},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1995_59_5_a6/}
}